The solution to housing unaffordability is a complex, multi-year deal, completely out of the reach of the hapless RBNZ. Consider the following non-central-bank actions needed:
trust-busting action over the cosy building-materials cartel duopoly, to lower material and hence build costs
elimination of zoning and other Brit Town and Country Planning artefacts: zoning, amongst other evils, causes Commuting, as living and working are forced to separate areas by planning fiat.
Encouragement of modularised/factory built housing - CNC gear, tight tolerances, built under cover by certified workers. Not bashed together on site by occasionally drug-free hammer hands and left to stand unprotected in the weather for weeks at a time. Unemployed Planners could usefully be press-ganged into such factories - win/win/win
Self-builds and other sweat-equity schemes could be revived. The current crop of regulation is unlikely to cost much less than $50-100K per dwelling, once fencing, scaff, fall protection, lost time, etc etc are accounted for properly. But it's All fer yer Own Good, little serfs....If we reverted to the situation of 15 years ago, when practically none of this crap existed,.....
Reform TLA regulation by introducing time-money into the equation and make them responsible for accounting the opportunity costs they impose. Time costs, incremented at IRD's UOMI rate, would be a start. TLA's inject time into every process imaginable, and currently have zero awareness of, and thus have zero accountability for, the costs they thereby force onto others. Time for some transparency.
Bring in friction to the sale process: stamp duties, CGT, whatever. A Tobin Tax if you will. In a similar vein, make TLA's tax the living bejasus outta unimproved but buildable land. They can do this by a simple differential rate, Ten or fifty times the going rate would claw back some the unearned CG the land bankers are squatting on, and might help to get something Built on that bare dirt.
Precisely none of the above can be done by Aunty RB.
It was done in Christchurch by emergency powers - benevolent diktat if you will.
Fat chance of anything happening in a national sense though.
That would take pollies at Gubmint and TLA level with the correct combinations of brains, thick skin, cojones and vertebrae. No such animal exists, despite extensive Attenborough-type searches over the years.